A self-priming pump

Abstract

The present invention discloses a self-priming pump, comprising a pump casing, an impeller and a drive motor; the pump casing has a cavity and a suction channel located in the cavity, and a drive chamber is recessed on its outer wall toward the cavity, the cavity, the drive chamber and the suction channel are connected in sequence, and the cavity and the suction channel are respectively provided with a connecting port connected to the outside, and the drive chamber is open on one side away from the cavity; the impeller is arranged in the drive chamber and rotates around its axis, and can drive the fluid to flow through the suction channel, the drive chamber and the cavity in sequence when rotating; the casing cover of the drive motor is arranged at the opening of the drive chamber, and its rotating shaft extends from the casing into the drive chamber and is connected to the impeller, and is used to drive the impeller to rotate around its axis. This solution does not require a coupling for transmission, avoids vibration and abnormal noise caused by misalignment of the shaft system, and at the same time makes the overall structure of the self-priming pump more compact, reduces the volume and weight of the self-priming pump, reduces the space occupied by the overall structure, is convenient for installation in small areas such as ship cabins, and improves practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of self-priming pumps, in particular to a self-priming pump. Background Art

[0002] Centrifugal pumps are important fluid conveying equipment in the marine, industrial, and agricultural sectors. Traditional self-priming centrifugal pumps generally operate using an external motor to drive the impeller within the pump. For example, patent CN 211174639 U discloses a self-priming pump comprising a motor and a pump body. The motor's output shaft and the impeller shaft of the pump body are connected by a coupling. The coupling halves between the motor and the pump body are uniformly provided with fixing grooves. The two coupling halves are locked together by a concave-shaped locking block, providing easy assembly and disassembly and a secure connection.

[0003] However, the impeller is located inside the pump body, while the motor is outside the pump body, connected by a coupling. Poor shaft alignment can easily induce mechanical vibration and noise. Furthermore, the pump body, drive shaft, and motor are coaxially mounted on the same base, resulting in large axial dimensions and heavy weight, making them difficult to install, operate, and maintain in confined spaces such as ship engine rooms. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and propose a self-priming pump to solve the technical problems in the prior art that the self-priming centrifugal pump is connected to the motor and the impeller through a coupling, has a large volume and weight, and is prone to abnormal vibration due to poor shaft alignment.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] The present invention provides a self-priming pump, comprising:

[0007] The pump housing has a cavity and a suction flow channel located in the cavity, and a drive cavity is recessed in the outer wall of the pump housing toward the cavity. The cavity, the drive cavity, and the suction flow channel are sequentially connected, and the cavity and the suction flow channel are respectively provided with a communication port connected to the outside, and the drive cavity is open on a side away from the cavity;

[0008] an impeller, rotatable about its axial direction and disposed in the driving chamber, and capable of driving the fluid to flow through the suction flow channel, the driving chamber and the cavity in sequence when rotating; and

[0009] The driving motor has a casing cover disposed at the opening of the driving cavity, and a rotating shaft thereof extends from the casing into the driving cavity and is connected to the impeller to drive the impeller to rotate around its axial direction.

[0010] In some embodiments, the drive motor further includes a rotor and two sets of stators. The rotor is located in the housing and is sleeved on the outer periphery of the rotating shaft. The two sets of stators are installed on the inner wall of the housing and are located on both sides of the rotor in the axial direction.

[0011] In some embodiments, stator cavities are provided at both ends of the housing in the axial direction. An annular partition is provided on the inner wall of each stator cavity, close to one end of the rotating shaft, extending toward the other stator cavity. Two groups of stators are respectively provided in the two groups of stator cavities. The rotor is located between the two annular partitions and has a gap reserved with each stator.

[0012] The drive motor further includes two sets of bearings and two sets of stator sealing cover plates. The two sets of bearings are respectively arranged between the two annular partitions and the rotating shaft. The two sets of stator sealing cover plates are respectively covered on one end of the two annular partitions close to the other annular partition.

[0013] In some embodiments, the rotating shaft and the housing are spaced apart from the side wall of the cavity to form a flow gap, and a return channel is provided along its axial direction, and the return channel connects the flow gap and the driving cavity.

[0014] In some embodiments, a transparent window is provided on a side of the flow gap away from the cavity, and the transparent window is opposite to the rotating shaft.

[0015] In some embodiments, the rotor includes a support ring, two groups of permanent magnets, two groups of rotor cores, and two rotor sealing cover plates. The support ring is sleeved on the outer circumference of the rotating shaft and is located between the two annular partitions. Mounting grooves are respectively provided on both sides of the support ring in the axial direction. The two groups of permanent magnets and the two groups of rotor cores are respectively provided in the two mounting grooves. The two rotor sealing plate covers are provided on the openings of the two mounting grooves. And / or,

[0016] The stator cavity is filled with heat-conducting sealant.

[0017] In some embodiments, the impeller includes a mounting sleeve, a first wheel plate, and a plurality of blades. The mounting sleeve is provided with a second wheel plate extending radially thereof. The first wheel plate is spaced apart from one side of the second wheel plate and is provided with a suction port. The plurality of blades are provided between the first wheel plate and the second wheel plate.

[0018] One end of the rotating shaft extending into the driving cavity extends from the mounting sleeve into the suction port, and a stepped surface is provided on the side of the mounting sleeve close to the housing, wherein the connection between the driving cavity and the suction flow channel is located in the axial direction of the rotating shaft, and the connection between the driving cavity and the cavity is located on one side in the radial direction of the first wheel plate;

[0019] The self-priming pump further comprises a flow guide cap, which is sleeved on one end of the rotating shaft extending into the suction port.

[0020] In some embodiments, a sealing boss is provided on one end of the first wheel plate away from the mounting sleeve, and the self-priming pump further comprises a first static sealing ring and a first dynamic sealing ring. The first static sealing ring is provided on the inner wall of the driving cavity and is located at the connection point between the driving cavity and the suction flow channel. The first dynamic sealing ring is sleeved on the outside of the sealing boss and corresponds to the first static sealing ring.

[0021] In some embodiments, the self-priming pump further includes a second static sealing ring and a second dynamic sealing ring, the second static sealing ring being mounted on a side of the housing close to the drive chamber, and a spacer ring being arranged on the outer periphery of the mounting sleeve, the second dynamic sealing ring being sleeved on the mounting sleeve and corresponding to the second static sealing ring.

[0022] In some embodiments, the communication port between the suction flow channel and the outside is located above the impeller and below the communication port between the cavity and the outside.

[0023] Compared with the prior art, in the self-priming pump provided by the present invention, the outer wall of the pump casing is concave toward the cavity thereof to form a driving cavity, and the impeller is placed in the driving cavity, and at the same time, the casing of the driving motor is directly covered at the opening of the driving cavity, so that the rotating shaft of the driving motor can be directly connected to the impeller, so that the rotating shaft of the driving motor can drive the external fluid from the connecting port of the suction channel into the suction channel when rotating, and then pass through the driving cavity and the cavity in turn, and finally be discharged from the connecting port of the cavity to realize fluid transportation. Therefore, this solution integrates the pump casing and the casing together, and does not require a coupling for transmission, thereby avoiding vibration and abnormal noise caused by misalignment of the shaft system, and at the same time makes the overall structure of the self-priming pump more compact, reduces the volume and weight of the self-priming pump, and reduces the space occupied by the overall structure, which is conducive to installation in small areas such as ship cabins and improves practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a self-priming pump provided by an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Cross-sectional view of the self-priming pump;

[0026] Figure 3 yes Figure 2 Cross-sectional view of the drive motor and impeller;

[0027] Figure 4 yes Figure 1 Schematic diagram of the middle pump casing;

[0028] Figure 5 yes Figure 4Cross-sectional view of the middle pump casing corresponding to the liquid outlet;

[0029] Figure 6 yes Figure 3 A partial schematic diagram of the middle drive motor;

[0030] Figure 7 yes Figure 3 A cross-sectional view of the middle casing;

[0031] Figure 8 yes Figure 3 A magnified schematic diagram of point A in the middle;

[0032] Figure 9 yes Figure 3 A cross-sectional view of the middle drive motor;

[0033] Figure 10 yes Figure 3 Cross-sectional view of the middle impeller;

[0034] Figure 11 yes Figure 2 Schematic diagram of the rotating shaft;

[0035] Figure 12 yes Figure 9 Schematic diagram of the middle support ring;

[0036] Figure 13 yes Figure 12 Cross-sectional view of the middle support ring.

[0037] Description of reference numerals:

[0038] 1. Pump casing; 1a. Cavity; 1a1. Liquid outlet; 1a2. Waste outlet; 1b. Suction channel; 1b1. Liquid inlet; 1c. Drive chamber; 1c1. Waste outlet; 1d. Connecting port; 1d1. Pump inlet; 1d2. Pump outlet; 2. Impeller; 21. Mounting sleeve; 211. Second wheel plate; 22. First wheel plate; 22a. Suction port; 221. Sealing boss; 23. Blades; 3. Drive motor; 31. Casing; 31a. Stator chamber; 31b. Flow clearance; 31c. Wiring hole; 311. Annular spacer Plate; 312, stator housing; 313, end cover; 32, rotating shaft; 32a, return channel; 321, step surface; 33, rotor; 331, support ring; 331a, mounting groove; 332, permanent magnet; 333, rotor core; 334, rotor sealing cover; 34, stator; 341, stator core; 342, winding; 35, bearing; 36, stator sealing cover; 37, transparent window; 4, guide cap; 5, first sealing static ring; 51, first sealing dynamic ring; 6, second sealing static ring; 61, second sealing dynamic ring. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] In order to solve the technical problems that a self-priming centrifugal pump is connected to a motor and an impeller through a coupling, resulting in a large volume and weight, and prone to abnormal vibration due to poor shaft alignment, the present invention provides a self-priming pump that can avoid vibration and abnormal noise caused by shaft misalignment, while making the overall structure of the self-priming pump more compact, reducing the volume and weight of the self-priming pump, and reducing the space occupied by the overall structure, which is conducive to installation in small areas such as ship cabins and improves practicality.

[0041] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 This is a structural schematic diagram of a self-priming pump in an embodiment of the present invention. The self-priming pump includes a pump casing 1, an impeller 2 and a drive motor 3; the pump casing 1 has a cavity 1a and a suction flow channel 1b located in the cavity 1a, and its outer wall surface is recessed with a drive cavity 1c facing the cavity 1a, the cavity 1a, the drive cavity 1c and the suction flow channel 1b are connected in sequence, and the cavity 1a and the suction flow channel 1b are respectively provided with a connecting port 1d connected to the outside, and the drive cavity 1c is open on the side away from the cavity 1a; the impeller 2 is arranged in the drive cavity 1c and rotates around its axial direction, and can drive the fluid to flow through the suction flow channel 1b, the drive cavity 1c and the cavity 1a in sequence when rotating; the casing 31 of the drive motor 3 is covered with the opening of the drive cavity 1c, and its rotating shaft 32 extends from the casing 31 into the drive cavity 1c and is connected to the impeller 2 for driving the impeller 2 to rotate around its axial direction.

[0042] In the self-priming pump provided by the present invention, the outer wall of the pump housing 1 is concave toward its cavity 1a to form a drive cavity 1c, and the impeller 2 is placed in the drive cavity 1c, and the housing 31 of the drive motor 3 is directly covered at the opening of the drive cavity 1c, so that the rotating shaft 32 of the drive motor 3 can be directly connected to the impeller 2, so that the rotating shaft 32 of the drive motor 3 can drive the external fluid from the connecting port 1d of the suction channel 1b into the suction channel 1b when rotating, and then pass through the drive cavity 1c and the cavity 1a in sequence, and finally be discharged from the connecting port 1d of the cavity 1a to realize fluid transportation. Therefore, this solution integrates the pump housing 1 and the housing 31 together, and does not require a coupling for transmission, thereby avoiding vibration and abnormal noise caused by misalignment of the shaft system, and at the same time making the overall structure of the self-priming pump more compact, reducing the volume and weight of the self-priming pump, and reducing the space occupied by the overall structure, which is conducive to installation in small areas such as ship cabins and improves practicality. It should be noted that the casing 31 and the pump casing 1 are connected by bolts and are provided with a sealing ring.

[0043] In one embodiment, see Figure 3 The drive motor 3 also includes a rotor 33 and two sets of stators 34. The rotor 33 is located in the housing 31 and is mounted on the outer periphery of the rotating shaft 32. The two sets of stators 34 are installed on the inner wall of the housing 31 and are located on both sides of the rotor 33 in the axial direction.

[0044] In this embodiment, the stator 34 and rotor 33 are arranged axially along the rotating shaft 32. Specifically, a stator 34 is provided on each axial side of the rotor 33. This ensures the rotational stability of the rotor 33 while also improving the compactness of the overall structure. It should be noted that in this embodiment, each stator 34 includes a stator core 341 and a winding 342.

[0045] In one embodiment, see Figures 6 to 8 The housing 31 has stator cavities 31a at both ends in the axial direction. An annular partition 311 is provided on the inner wall of each stator cavity 31a, close to the end of the rotating shaft 32, extending toward the other stator cavity 31a. Two groups of stators 34 are respectively arranged in the two groups of stator cavities 31a. The rotor 33 is located between the two annular partitions 311 and has a gap reserved with each stator 34. The drive motor 3 also includes two groups of bearings 35 and two groups of stator sealing cover plates 36. The two groups of bearings 35 are respectively arranged between the two annular partitions 311 and the rotating shaft 32. The two groups of stator sealing cover plates 36 are respectively covered on one end of the two annular partitions 311 close to the other annular partition 311.

[0046] In this embodiment, please refer to Figure 3 The stator 34 is sealed in the stator cavity 31a by an annular partition 311 and a stator sealing cover plate 36, preventing fluid from corroding the stator 34 and extending the service life of the stator 34. At the same time, a gap is reserved between the stator 34 and the rotor 33, allowing the fluid in the drive cavity 1c to flow through the gap between the inner and outer rings of the bearing 35 and the gap between the stator 34 and the rotor 33 to the side of the rotating shaft 32 away from the cavity 1a, that is, into the space on the right side of the rotating shaft 32, thereby cooling the motor and lubricating the bearing 35. It should be noted that the gap reserved between the rotor 33 and the stator 34 is the air gap between the stator and rotor 33 of the axial flux motor. The greater the power, the larger the air gap, usually 0.5 to 5 mm. In addition, a temperature sensor is provided in the stator cavity 31a to monitor the temperature of the winding 342.

[0047] In one embodiment, see Figure 6 and Figure 7 The rotating shaft 32 and the housing 31 are spaced apart from the side wall of the cavity 1a to form a flow gap 31b, and a return channel 32a is provided along its axial direction, and the return channel 32a connects the flow gap 31b and the driving cavity 1c.

[0048] In this embodiment, the fluid flows sequentially through the drive chamber 1c, the left bearing 35, the gap between the left stator 34 and rotor 33, the right bearing 35, and the gap between the right stator 34 and rotor 33, before finally entering the flow gap 31b on the right side of the rotating shaft 32. The fluid then flows back into the drive chamber 1c through the return channel 32a of the rotating shaft 32. This allows the fluid to circulate between the left and right sides of the rotating shaft 32, further enhancing the cooling and lubrication of the motor and bearing 35.

[0049] In one embodiment, see Figure 9 A transparent window 37 is provided on the side of the flow gap 31 b away from the cavity 1 a , and the transparent window 37 is opposite to the rotating shaft 32 .

[0050] In this embodiment, the diversion and return flow channels 32a of the rotating shaft 32 can be observed for dirt and blockage through the transparent window 37. In addition, in one embodiment, a pressure sensor and a temperature sensor can be provided in the flow gap 31b to monitor the fluid pressure and temperature of the chamber on the right side of the rotating shaft 32.

[0051] In one embodiment, see Figure 12 and Figure 13 The rotor 33 includes a support ring 331, two groups of permanent magnets 332, two groups of rotor cores 333 and two rotor sealing cover plates 334. The support ring 331 is mounted on the outer periphery of the rotating shaft 32 and is located between the two annular partitions 311. Mounting grooves 331a are respectively provided on both sides of the support ring 331 in the axial direction. The two groups of permanent magnets 332 and the two groups of rotor cores 333 are respectively provided in the two mounting grooves 331a. The two rotor 33 sealing plate covers are provided at the openings of the two mounting grooves 331a.

[0052] In this embodiment, the rotor 33 is configured as a support ring 331, with mounting grooves 331a provided on both sides of the support ring 331 for mounting the permanent magnets 332 and the rotor 33 core. This ensures that the rotor 33 can stably drive the rotating shaft 32 while also making the rotor 33 relatively compact. Furthermore, a sealing plate on the rotor 33 seals the permanent magnets 332 and the rotor 33 core within the mounting grooves 331a, extending their service life.

[0053] In addition, in one embodiment, the stator cavity 31a is filled with thermally conductive sealant. Specifically, each stator cavity 31a is provided with a wiring hole 31c connected to the outside. After the stator 34 is assembled, the thermally conductive sealant can be filled into the corresponding stator cavity 31a through the wiring hole 31c to ensure the heat dissipation and sealing performance of the winding 342.

[0054] In one embodiment, see Figure 10 and Figure 11The impeller 2 includes a mounting sleeve 21, a first wheel plate 22 and a plurality of blades 23. The mounting sleeve 21 is provided with a second wheel plate 211 extending radially thereof. The first wheel plate 22 is spaced apart on one side of the second wheel plate 211 and is provided with a suction port 22a. A plurality of blades 23 are provided between the first wheel plate 22 and the second wheel plate 211; one end of the rotating shaft 32 extending into the drive chamber 1c extends into the suction port 22a from the mounting sleeve 21, and a step surface 321 is provided on the side of the mounting sleeve 21 close to the casing 31, wherein the connection between the drive chamber 1c and the suction flow channel 1b is located in the axial direction of the rotating shaft 32, and the connection between the drive chamber 1c and the cavity 1a is located on one side of the radial direction of the first wheel plate 22; the self-priming pump also includes a guide cap 4, which is sleeved on one end of the rotating shaft 32 extending into the suction port 22a.

[0055] In this embodiment, the impeller 2 is locked on the rotating shaft 32 by the guide cap 4, and when the impeller 2 rotates, the fluid enters the suction port 22a from the suction channel 1b, and is then driven by the blades 23 between the two wheel plates to be delivered to the cavity 1a. Figure 4 In this solution, the connection between the suction channel 1b and the drive chamber 1c is defined as the liquid inlet 1b1, and the connection between the drive chamber 1c and the cavity 1a is defined as the liquid outlet 1a1. Furthermore, the connection port 1d between the suction channel 1b and the outside is defined as the pump inlet 1d1, and the connection port 1d between the cavity 1a and the outside is defined as the pump outlet 1d2.

[0056] In addition, it should be noted that, in one embodiment, the guide cap 4 is threadedly connected to the rotating shaft 32 and further locked by a pin hole and a pin. Furthermore, based on the embodiment of the return channel 32a, the guide cap 4 is further provided with a hole to facilitate return flow.

[0057] In one embodiment, a sealing boss 221 is provided at one end of the first wheel plate 22 away from the mounting sleeve 21. The self-priming pump further includes a first static sealing ring 5 and a first dynamic sealing ring 51. The first static sealing ring 5 is provided on the inner wall of the driving chamber 1c and is located at the connection point between the driving chamber 1c and the suction flow channel 1b. The first dynamic sealing ring 51 is sleeved on the outside of the sealing boss 221 and corresponds to the first static sealing ring 5.

[0058] In this embodiment, dynamic and static sealing rings are installed at the interface between sealing boss 221 and suction channel 1b to prevent fluid from entering drive chamber 1c without passing through suction port 22a. This ensures that fluid can enter between the two impeller plates from suction channel 1b via suction port 22a, where it can be effectively driven by blades 23, enter chamber 1a through liquid outlet 1a1, and ultimately be discharged through pump outlet 1d2, thereby increasing the output head. It should be noted that the radial clearance between the first static sealing ring 5 and the first dynamic sealing ring 51 is controlled to be 0.1 mm to 0.2 mm.

[0059] In one embodiment, the self-priming pump further includes a second static sealing ring 6 and a second dynamic sealing ring 61. The second static sealing ring 6 is mounted on a side of the housing 31 close to the drive chamber 1c, and a spacer ring is arranged on the outer periphery of the mounting sleeve 21. The second dynamic sealing ring 61 is sleeved on the mounting sleeve 21 and corresponds to the second static sealing ring 6.

[0060] In this embodiment, a dynamic seal ring and a static seal ring are further disposed between the mounting sleeve 21 and the housing 31 to control the flow of fluid into the housing 31 from the gap between the rotating shaft 32 and the housing 31. Specifically, in this embodiment, based on the embodiment of the return channel 32a, a radial gap exists between the second static seal ring 6 and the second dynamic seal ring 61. This radial gap is controlled to be between 0.2 mm and 0.4 mm, allowing fluid to pass through the radial gap between the second static seal ring 6 and the second dynamic seal ring 61.

[0061] In one embodiment, the communication port 1d between the suction flow channel 1b and the outside is located above the impeller 2 and below the communication port 1d between the cavity 1a and the outside.

[0062] In this embodiment, the pump body inlet 1d1 is arranged above the impeller 2, and the pump body outlet 1d2 is arranged above the pump body inlet 1d1. This ensures that the impeller 2 is immersed in the pumped liquid each time the pump is shut down, ensuring that the pump can effectively self-prime when it is next started. It should be noted that the liquid outlet 1a1 is arranged at the upper end of the drive chamber 1c and corresponds to the pump body outlet 1d2. In addition, a waste liquid port 1c1 is provided at the bottom of the drive chamber 1c. The waste liquid port 1c1 is connected to the bottom of the chamber 1a. The bottom of the chamber 1a also has a waste outlet 1a2 connected to the outside. The waste outlet 1a2 is provided with a waste valve to facilitate regular cleaning.

[0063] In addition, it should be noted that, in one embodiment, the casing 31 is composed of two stator shells 312 and an end cover 313. The two stator shells 312 together enclose a cavity. The end cover 313 is arranged at the end of the stator shell 312 away from the cavity 1a and is provided with a transparent window 37. Each connection is connected by bolts and a corresponding sealing ring is provided.

[0064] In order to better understand the present invention, the following Figures 1 to 13 The technical solution of the present invention is described in detail:

[0065] In this embodiment, when the pump unit is manufactured and assembled, the above-mentioned components should be manufactured first, and the stator 34 component and the rotor 33 component of the drive motor 3 should be assembled in place, and then the drive system and the impeller 2 should be installed in place and locked, and finally the whole should be installed in the drive chamber 1c of the pump housing 1.

[0066] For the motor, the stator core 341 and winding 342 of the drive motor 3, along with the coils of the winding 342 and the position and temperature sensors, should first be installed within the stator cavity 31a of the drive motor 3. The stator sealing cover 36 should then be mounted to the corresponding end surface of the annular partition 311 by welding or other means, ensuring that the stator sealing cover 36 is in close contact with the surfaces of the stator core 341 and winding 342. This packaging process ensures that while the motor stator 34 is cooled by pumped liquid, the winding 342 is isolated from the external pumped liquid. After installation, a high-thermal-conductivity sealant is poured through the wiring holes 31c to fill the space in the stator cavity 31a except for the stator core 341 and winding 342.

[0067] For the rotor 33 assembly of the drive motor 3, the rotor core 333 of the drive motor 3 is first mounted on either side of the support ring 331, ensuring that the three are coaxial. Permanent magnets 332 are then mounted on the outer surface of the rotor core 333. The rotor sealing cover 334 is welded or otherwise mounted to the mounting slot 331a of the support ring 331, completing the encapsulation of the rotor core 333 and magnets. After encapsulation, glue is injected into the rotor 33 cavity 1a through the corresponding reserved holes in the support ring 331, and the glue injection holes are sealed, completing the production of the rotor 33 assembly of the drive motor 3.

[0068] During assembly, first complete the assembly of the drive system and impeller 2. The specific steps are as follows: (1) Install the rotor 33 assembly of the drive motor 3 on the rotating shaft 32 and tighten it with a pressure cap; (2) Install the bearing 35 in the inner hole seat of the annular partition 311, insert the rotating shaft 32 into the inner hole of the bearing 35 from the left, and install it in place; (3) Install another bearing 35 on the right side of the rotating shaft 32, install the other pressure cap to the corresponding seat hole and lock it. This completes the installation of the stator and rotor 33 assembly of the drive motor 3. (4) Install the second static sealing ring 6 and the second dynamic sealing ring 61 to the corresponding inner holes of the casing 31, and install the first dynamic sealing ring 51 to the sealing boss 221 of the impeller 2; (5) Install the impeller 2 on the transmission shaft and lock it with the guide cap 4. This completes the assembly of the drive system and impeller 2. (6) Install the first static seal ring 5 into the suction channel 1b near the liquid inlet 1b1. Install the assembled drive system and impeller 2 into the drive chamber 1c of the pump body. (7) Install the transparent window 37 onto the end cover 313 and press it with the gland. Install the end cover 313 onto the stator housing 312 of the drive motor 3. This completes the installation of the entire pump.

[0069] During operation, the pump body is first filled with the pumped liquid, completely submerging the impeller 2. The pump unit is then started to achieve liquid suction and discharge. By adjusting the frequency of the input voltage, the speed, flow rate, and lift of the pump unit can be adjusted. Under pressure, the liquid on the left side of the impeller 2 flows sequentially through the radial clearance between the second dynamic seal ring 61 and the second static seal ring 6, the bearing 35, the air gap between the stator sealing cover plate 36 and the rotor sealing cover plate 334, and enters the space to the right of the rotating shaft 32. Through the return flow channel 32a on the axis of the rotating shaft 32 and the hole in the guide cap 4, it enters the suction port 22a of the impeller 2, achieving cooling of the motor and lubrication of the bearing 35. The direction of the rotating shaft and the presence of dirt and blockage in the return flow channel 32a can be observed through the transparent window 37. Pressure and temperature sensors can also be installed on the end cover 313 to monitor the pressure and temperature of the liquid flowing through the chamber on the right side of the drive shaft.

[0070] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A self-priming pump, characterized in that: include: The pump housing has a cavity and a suction flow channel located in the cavity, and a drive cavity is recessed in the outer wall of the pump housing toward the cavity. The cavity, the drive cavity, and the suction flow channel are sequentially connected, and the cavity and the suction flow channel are respectively provided with a communication port connected to the outside, and the drive cavity is open on a side away from the cavity; an impeller, rotatable about its axial direction and disposed in the driving chamber, and capable of driving the fluid to flow through the suction flow channel, the driving chamber and the cavity in sequence when rotating; and a drive motor, wherein the housing cover is disposed at the opening of the drive cavity, and the rotating shaft extends from the housing into the drive cavity and is connected to the impeller to drive the impeller to rotate about its axial direction; The drive motor further comprises a rotor and two sets of stators, wherein the rotor is located in the housing and is sleeved on the outer periphery of the rotating shaft, and the two sets of stators are mounted on the inner wall of the housing and are located on both sides of the rotor in the axial direction; Stator cavities are provided at both ends of the housing in the axial direction. An annular partition is provided on the inner wall of each stator cavity, close to one end of the rotating shaft, extending toward the other stator cavity. The two groups of stators are respectively provided in the two groups of stator cavities. The rotor is located between the two annular partitions and has a gap reserved with each stator. The drive motor further comprises two sets of bearings and two sets of stator sealing cover plates, the two sets of bearings being respectively arranged between the two annular partitions and the rotating shaft, and the two sets of stator sealing cover plates being respectively arranged to cover one end of the two annular partitions close to the other annular partition; The rotor includes a support ring, two groups of permanent magnets, two groups of rotor cores and two rotor sealing cover plates. The support ring is sleeved on the outer circumference of the rotating shaft and is located between the two annular partitions. Mounting grooves are respectively provided on both sides of the support ring in the axial direction. The two groups of permanent magnets and the two groups of rotor cores are respectively arranged in the two mounting grooves. The two rotor sealing plate covers are arranged on the openings of the two mounting grooves.

2. The self-priming pump according to claim 1, characterized in that The rotating shaft and the housing are spaced apart from the side wall of the cavity to form a flow gap, and a return channel is provided along the axial direction thereof, and the return channel communicates with the flow gap and the driving cavity.

3. The self-priming pump according to claim 2, characterized in that A transparent window is provided on a side of the flow gap away from the cavity, and the transparent window is directly opposite to the rotating shaft.

4. The self-priming pump according to claim 1, characterized in that The stator cavity is filled with heat-conducting sealant.

5. The self-priming pump according to claim 1, characterized in that The impeller includes a mounting sleeve, a first wheel plate and a plurality of blades. The mounting sleeve is provided with a second wheel plate extending radially thereof. The first wheel plate is spaced apart from one side of the second wheel plate and is provided with a suction port. The plurality of blades are provided between the first wheel plate and the second wheel plate. One end of the rotating shaft extending into the driving cavity extends from the mounting sleeve into the suction port, and a stepped surface is provided on the side of the mounting sleeve close to the housing, wherein the connection between the driving cavity and the suction flow channel is located in the axial direction of the rotating shaft, and the connection between the driving cavity and the cavity is located on one side in the radial direction of the first wheel plate; The self-priming pump further comprises a flow guide cap, which is sleeved on one end of the rotating shaft extending into the suction port.

6. The self-priming pump according to claim 5, characterized in that A sealing boss is provided on one end of the first wheel plate away from the mounting sleeve. The self-priming pump further comprises a first static sealing ring and a first dynamic sealing ring. The first static sealing ring is provided on the inner wall of the driving cavity and is located at the connection point between the driving cavity and the suction flow channel. The first dynamic sealing ring is sleeved on the outside of the sealing boss and corresponds to the first static sealing ring.

7. The self-priming pump according to claim 5, characterized in that The self-priming pump also includes a second static sealing ring and a second dynamic sealing ring. The second static sealing ring is installed on a side of the housing close to the drive chamber, and a spacer ring is arranged on the outer periphery of the mounting sleeve. The second dynamic sealing ring is sleeved on the mounting sleeve and corresponds to the second static sealing ring.

8. The self-priming pump according to claim 1, characterized in that The communication port between the suction flow channel and the outside is located above the impeller and below the communication port between the cavity and the outside.

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